Improvement in grinding-mills made of metal



JSheets-Sheetl. H. B. STEVENS. GRINDING-MILLS MADE OF METAL.

No. 193,785. Patentpd July 31,1877.

N4 PETERS. PHOTuLxTI-IOGRAPHER. WASHINGYON. o C.

Law 5;)"

2 Sheets-Sheet 2.

I H. B. STEVENS. V GRINDING-MILLS MADE OF METAL.

No. 193,785 Patented July 31, 1 877 HENBY B. STEVENS, OF

BUFFALO, new YORK, ASSIGNOR T0 enonen n.

SQUIER, or SAME PLACE.

IMPROVEMENT IN GRl-NDING-M ILLS MADE OF METAL.

Specification forming part of Letters Patent No. 193,736, dated July 31, 1877; application-filed June 4, 1 877.

To all whom it may concern:

Be it known that I, HENRY B. STEVENS,

of the city of Buffalo, in, the county of Erie ,grinding corn and other grain in a wet or dry state, and in whichthe grinding parts consist of a metallic cone revolving within acorrespondingly-shaped concave.

My present improvements relate to a mill of this description for which Letters Patent of the United States No. 137 ,503 were granted to me April3,1873,to which referenceis hereby made for a full description of said mill.

The object of my invention is to construct the mill in such manner that the concave can be easily removed from the cone, and the parts be cleaned every time the mill is used also, so that the cone can be readily detached from its shaft and replaced by a new one when it is worn out; also, so that the cone and concave can be adjusted toward and from each other to adapt the machine for granulating and grinding various substances, and so that the velocity of the cone can be regulated according to the requirements of the substance intended to be ground.

The nature of my invention will be fullyunderstood from the following description In the accompanying drawings, consisting of two sheets,'Figure l is a sectional elevation of a mill provided with my improvements. Fig. 2 is a plan view thereof. Fig. 3 is a vertical section in line w as, Fig. 2. Fig. 4 is an end elevation of the mill. Fig.5isa detached sectional view of the cone at right angles to Fig. 1.

Like letters of reference designate like parts in each of the figures.

A represents 1 thesupporting bracket or frame of the machine, provided with a baseplate, a, by which it is secured to any suitable horizontal. or vertical support, as may be most convenient.- b is the shaft or spindle,

turning in a bearing, 1), formed with the bracket or frame A. O is the metallic cone mounted on one end of the spindle b, and provided at its smaller end with a feed-screw, d. E is the concave surrounding the cone G, and c the mouth of theconcave,-inclosing the feedscrew d and connecting with the feed-hopper F.

The concave E is connected with the frame A by two bolts, gg, having oblong heads g and passing through circumferential flanges or lugs e of the concave, as clearly shown in Fig. 4. The lugs e of the concave are provided with four elongated or oblong-openings, 6 which permit the heads g of thebolts g'to ,pass through in one position only, so that,

upon releasing the thumb-nuts g and turning the bolts so that their heads will passthrough the oblong holes of the concave, the latter can be removed without requiring the bolts g-tobe withdrawn. I

This construction enablesthe grinding-surfaces to be separated when required" to be cleaned, and to be connected together after the cleaning is accomplished, in a very simple and expeditious manner. p

Thelugs e of the concave are provided on their outer side with shallow recesses or sockets 0 arranged at right angles to the longitudinal direction of the openings e ,'for the reception of the elongated bolt-heads g when in a locked position, to prevent the-"bolts from being accidentally turned.

The four openings 6 provided in the flange or lugs of the concave E permit the position of the concave and feed-hopper to be changed with reference to the main frame A, so that the latter may be secured to a horizontal or vertical support, as may be most convenient.

It represents a spring of rubber, steel, or other suitable material, arranged oneach of the bolts 9 between the frame A and concave E, so as to hold thelatter away from the cone, thereby enabling the concave to be adjusted toward and from the cone simply by turning the thumb-nuts g This arrangement of the springsh, in holding the concave away from the cone, enables the machine to be used for' granulating substances to any desireddegree of fineness, the

size of the granules produced being dependout upon the width of the space between the cone and concave.

If desired, an additional spring, It, may be arranged in the usual manner on each bolt g between the thumb-nut g and the frame A, whereby the concave is rendered self-adjusting axially and laterally with reference to the cone.

The cone 0 is fitted loosely on the shaft 1), and driven by means of a flat key, 6, secured diametrically in the shaft, and entering notches or recesses 0 formed in the end of the hub c of the cone, as clearly shown in Figs. 1, 2, and 5. la is a washer placed upon the shaft b between the hub of the cone 0 and the frame A, and provided with notches or recesses k for receiving the other half of the flat key '5. The washer 70 receives the thrust of the grindingpressure, and the wear is consequently concentrated upon this washer, which is easily and cheaply renewed. The cone being attached to the shaft b, as above described, it is readily removed when worn out, and replaced by a new one, upon removing the concave E, which is very desirable, as in countries where mills of this description are used there are few, if any, mechanics sufficiently skilled to properly repair a machine of this kind.

L is a gear-wheel mounted on the end of the shaft 1), projecting through the outer end of the frame A, and l the driving-pinion meshing with the wheel L. The gear-wheel L is fitted loosely on the shaft 1), so as to be readily slipped on or off, and the shaft is provided with a key, m, whereby the rotary motion of the gear-wheel L is transmitted to the shaft. 12. n are two lugs cast with the frame A, and arranged diametrically opposite each other at the outer end of the bearing 12. O is a bridgetree arranged on the outer side of the gearwheel L, and connected with the lugs n n by stay-bolts 10. q is a set-screw arranged in the bridge-tree 0, so as to bear against the end of the shaft b, for adjusting the same axially in the frame A.

By means of the set-screw q the position of the cone 0 with reference to the concave E and frame A can be very nicely regulated, while by tightening or releasing the thumbnuts 9 of the bolts g the concave E is respectively closed upon or removed from the cone, as may be desired. In this manner the machine is readily adapted to the contemplated use either for granulating or grinding various substances to any degree of fineness.

The driving-pinion 1 turns loosely on a stud, 1, secured in a lug or arm, R, cast with the frame A at right anglesgto the lugs n. The arm R is provided with a radial slot, '1', in which the stud r is secured by a screw-nut, r, so that the stud can be adjusted toward and from the shaft 1). This construction permits of the gear-wheel L and pinion l to be exchanged one for the other, or to be replaced by wheels of different diameters upon removing the bridge-tree 0, for varying the speed of the cone in accordance with the nature of the work to be performed by the machine. For grinding substances that are easily ground the large gear-wheel is arranged upon the shaft 1), while for grinding more refractory substances the small gear-wheel is placed upon the shaft. 8 represents the crank, turning loosely upon the stud r, and connected with the gear-wheel arranged upon the stud by a projection, pin, or lug, .8, formed with or secured to the crank, and engaging in a recess formed in the respective gearwheel.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the frame or bracket A, provided with fastening-bolts 9, having elongated heads g and cone 0, of the concave E, provided with elongatedopenings 6 adapting the concave to be removed from the cone without detaching the bolts, substantially as hereinbefore set forth.

2. The combination, with the frame A, cone 0, and fastening-bolts g, having elongated heads 9 of the concave E, provided with elongated openings 0 and recesses 6 arranged at right angles to the openings a, substantially as and for the purpose hereinbefore set forth.

3. The combination, with the frame A, cone I O, concave E, and fastening-bolts g, of the springs h, arranged on the bolts g between the frame and the concave, and the springs h, arranged on the bolts g between the frame and the nuts 9 substantially as and for the purpose hereinbefore set forth.

4.. The combination, with the'frame A, shaft b, and removable concave E, of the cone 0, fitted loosely upon the end of the shaft, and having its hub 0 formed with recesses or keyseats 0, and the key i, secured diametrically in the shaft 1), so as to permit the cone to be detached from the shaft by simply removing the concave, and without requiring the key to be withdrawn, substantially as and for the purpose hereinbefore set forth.

5. The combination, with the frame A and concave E, of the shaft 1), provided with the key 7;, cone 0, having its hub 0 provided with recesses 0, and washer k, arranged between the frame A and the hub of the cone, and provided with recesses 70, substantially as and for the purpose'hereinbefore set forth.

6. The combination, with the frame A, shaft 1), cone 0, and concave E, of the arm R, provided with stud 1' and radial slot 1', and detachable gear-wheels L l, substantially as and for the purpose hereinbefore set forth.

H. .B. STEVENS. Witnesses:

EDWARD WILHELM, OHAs. J. BUOHHEIT. 

